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from the Septum, or middle Partition, to its oppo- 
fite Sides; whereby they act as fo many Braces in 
the c Dia(lole, and when they contract, they alfo 
affift in the Syfiole . And perhaps it may not be 
the moft improbable Conjecture to think; that as 
much Care may have been taken in providing a 
lufficient Number of Fibres, or little Mufcles, which 
may be fo formed as to act in the c Diafto!e , as An- 
tagonifts to thofe which occafion the Syftole. 
CELL 
• 
The Hearts of Frogs, Vipers, Eels, &c. feem to 
evince the Reafonablenefs of this Conjecture, by 
continuing their Syfioles and ‘Diaftoles after they 
are taken out of the Body ; when there is no re- 
fluent Blood to dilate the Ventricles, and, confe- 
quently, if there were no Fibres upon the Stretch, 
when the Heart is contracted, which, by their Elaf- 
ticity, or reftitutive Power, did pull back, or elon- 
gate fuch as were contracted, there could not pof- 
fibly be any < T)iafto!e in fuch Circumflances. 
CXXII. 
We are affured by Mr. Boyle , in his Bhyfico - 
Mechanical Experiments , that the Heart of an Eel 
hath continued to beat an Hour, in an exhaufted 
Receiver ; after which, finding its Motion very lan- 
guid, and almofl: ceafed, by breathing a little upon 
that Part of the Glafs where the Heart was, it 
quickly regain'd Motion s and an Hour after that. 
A 
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